Casio Men's WVA109HDA-2BV Waveceptor Atomic Watch Quartz movement Auto receive function (4 times per day); signal: WWVB, Frequency: 60kHz Auto EL backlight with afterglow; world time 29 times zones (48 cities), city code display, daylight saving auto on/off Water resistant to 660 feet (200 M): suitable for recreational scuba diving